Long-Term Debt (Details Textual) $ in Thousands, BRL in Millions	3 Months Ended	9 Months Ended	12 Months Ended
	Dec. 31, 2017 USD ($)	Sep. 30, 2017 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2017 BRL	Sep. 30, 2015 USD ($)	Jun. 30, 2014 USD ($)
Long Term Debt (Textual) [Abstract]
Lease Expiration Date	Jun. 01, 2034
Short-term Debt				$ 16,200
Unamortized debt issuance cost	$ 3,500		$ 3,500
Number of manufacturer-affiliated finance partners	3		3			3
Unsecured Debt, Current	$ 24,700		$ 24,700
Borrowings Of Long Term Debt Related To Real Estate Loans			75,309	42,654	$ 32,026
Long-term Debt, Percentage Bearing Fixed Interest, Amount	86,800		86,800	93,900
Amortization Cost of Mortgage Facility, Real Estate Related Debt and Acquisition Line			3,661	3,694	3,652
Impact of interest rate derivative instruments related to Mortgage Facility			1,900	2,300	1,800
Total interest expense related to capital leases, net of interest income			8,200	6,600	7,600
Interest costs capitalized on construction projects			1,600	1,700	700
Unsecured Debt [Member]
Long Term Debt (Textual) [Abstract]
Repayments of Long-term Debt		$ 300
Proceeds from Issuance of Unsecured Debt			25,100
5.00% Senior Note [Member]
Long Term Debt (Textual) [Abstract]
Note agreement with a third party financial institution	$ 550,000		$ 550,000	550,000			$ 200,000	$ 350,000
Debt interest rate	5.00%		5.00%			5.00%
Maturity date of notes			Jun. 01, 2022
Additional borrowings discount from face value	1.50%		1.50%			1.50%
Amortization period of underwriters fees, debt issuance costs, and discount			8 years
Unamortized Underwriters Fees, Discount, and Debt Issuance Costs	$ 7,900		$ 7,900
Long-term Debt, Fair Value	567,900		567,900	548,400
5.25% Senior Note [Member]
Long Term Debt (Textual) [Abstract]
Note agreement with a third party financial institution	$ 300,000		$ 300,000	$ 300,000
Debt interest rate				5.25%
Maturity date of notes			Dec. 15, 2023
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed			35.00%
Redemption price percentage of principal outstanding and accrued unpaid interest	105.25%		105.25%			105.25%
Redemption price percentage of principal redeemed	100.00%		100.00%			100.00%
Amortization period of underwriters fees and debt issuance costs			8 years
Unamortized Underwriters Fees and Debt Issuance Costs	$ 3,800		$ 3,800
Long-term Debt, Fair Value	$ 310,900		$ 310,900	$ 297,000
Other Real Estate Related Long Term Debt [Member] | Minimum [Member]
Long Term Debt (Textual) [Abstract]
Debt interest rate	3.25%		3.25%			3.25%
Other Real Estate Related Long Term Debt [Member] | Maximum [Member]
Long Term Debt (Textual) [Abstract]
Debt interest rate	4.69%		4.69%			4.69%
Capital Lease Obligations [Member]
Long Term Debt (Textual) [Abstract]
Debt, Weighted Average Interest Rate	10.40%		10.40%	9.90%		10.40%
U.K. Working Capital Loan [Member]
Long Term Debt (Textual) [Abstract]
Short-term Debt	$ 13,400		$ 13,400
Additional Borrowings			5,100
Proceeds from Short-term Debt			0
Number of loans as per loan agreements	0
Convertible and Senior Notes [Member]
Long Term Debt (Textual) [Abstract]
Total interest expense excluding amortization cost			43,300	$ 43,300	28,500
Amortization cost of the 3.00% notes, 2.25% Notes, 5.00% Notes, and 5.25% Notes			$ 2,200	2,100	1,500
Brazilian third party financial institution [Member]
Long Term Debt (Textual) [Abstract]
Maturity date of notes			Feb. 01, 2020
Total borrowings | BRL						BRL 6.6
Borrowings Of Long Term Debt Related To Real Estate Loans			$ 0
Brazil Note [Member]
Long Term Debt (Textual) [Abstract]
Maturity date of notes			Apr. 01, 2025
Total borrowings	$ 3,300		$ 3,300
Long-term Debt, Current Maturities	400		400
Repayments of Long-term Debt			600
Borrowings Of Long Term Debt Related To Real Estate Loans			0
Real Estate Related and Other Long Term Debt [Member]
Long Term Debt (Textual) [Abstract]
Note agreement with a third party financial institution	398,000		398,000
Unamortized debt issuance cost	600		600
Total borrowings	350,000		350,000	321,900
Long-term Debt, Current Maturities	26,400		$ 26,400	39,800
Number of loans as per loan agreements			57
Repayments of Long-term Debt			$ 18,400
Proceeds from Issuance of Long-term Debt			$ 46,400
Real Estate Related and Other Long Term Debt [Member] | Minimum [Member]
Long Term Debt (Textual) [Abstract]
Variable Interest Rate			1.50%
Real Estate Related and Other Long Term Debt [Member] | Maximum [Member]
Long Term Debt (Textual) [Abstract]
Maturity date of notes			Nov. 01, 2032
Variable Interest Rate			2.50%
Fixed interest rate debt [Member]
Long Term Debt (Textual) [Abstract]
Long-term Debt, Fair Value	92,900		$ 92,900	94,500
Real Estate Credit Facility, Real Estate Related Debt and Acquisition Line [Member]
Long Term Debt (Textual) [Abstract]
Total interest expense excluding amortization cost			$ 15,000	13,700	$ 17,600
U.K. Notes [Member]
Long Term Debt (Textual) [Abstract]
Maturity date of notes			Sep. 01, 2034
Total borrowings	79,200		$ 79,200	50,400
Long-term Debt, Current Maturities	7,400		$ 7,400	$ 4,300
Number of loans as per loan agreements			16
Repayments of Long-term Debt			$ 5,700
Borrowings Of Long Term Debt Related To Real Estate Loans			28,900
Revolving Credit Facility [Member]
Long Term Debt (Textual) [Abstract]
Line of Credit Facility, Maximum Borrowing Capacity	$ 1,800,000		1,800,000
Line of Credit Facility, Expiration Date	Jun. 17, 2021
Revolving Credit Facility, Acquisition Line [Member]
Long Term Debt (Textual) [Abstract]
Line of Credit Facility, Maximum Borrowing Capacity	$ 360,000		360,000
Line of credit facility minimum borrowing capacity	$ 50,000		$ 50,000
Variable Interest Rate			1.50%